Recent progress on colloidal metal nanoparticles as signal enhancers in nanosensing

Abalde‐Cela, Sara; Carregal‐Romero, Susana; Coelho, João Paulo; Guerrero‐Martínez, Andrés

doi:10.1016/j.cis.2015.05.002

Cited by 58 publications

(28 citation statements)

References 130 publications

(177 reference statements)

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“…In order to lower detection limits further, metal enhanced fluorescence may be incorporated. The potential for fluorescent biosensing based on metal enhanced fluorescence (MEF) has previously been extensively reviewed 10,11 with much focus on the synthesis of suitable nanostructures to produce high fluorescence enhancement factors. However, beyond simply the fabrication of these nanostructures, this review focuses primarily on instances in which MEF has already been incorporated suc-cessfully for biosensing applications.…”

Section: Introductionmentioning

confidence: 99%

Metal enhanced fluorescence biosensing: from ultra-violet towards second near-infrared window

2018

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Section: Introductionmentioning

confidence: 99%

Metal enhanced fluorescence biosensing: from ultra-violet towards second near-infrared window

2018

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“…Plasmonic nanostructures (PNSs) exhibit excellent optical properties that allow them to produce intensified localized electric fields near their surfaces as a result of the excitation of their localized surface plasmon resonance (LSPR) mode. This phenomenon provides the capability of PNSs to be utilized as substrates in amplifying characteristic Raman signals of analytes in an ultrasensitive detection technique of surface-enhanced Raman spectroscopy (SERS) [1,2].…”

Section: Introductionmentioning

confidence: 99%

Ag Nanostructures with Spikes on Adhesive Tape as a Flexible Sers-Active Substrate for In Situ Trace Detection of Pesticides on Fruit Skin

et al. 2019

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Nanostructures with spikes (NSPs) have been a subject of several surface-enhanced Raman scattering (SERS) applications owing to their significant Raman signal enhancement brought about by the combined effects of interspike coupling and the accumulated induction on the tips of spikes. Thus, NSPs offer great potential as a SERS-active substrate for relevant applications that require a high density of enhanced “hot spots”. In this study, Ag NSPs were synthesized in varying degrees of agglomeration and were thereafter deposited onto a transparent adhesive tape as a flexible substrate for SERS applications, specifically, in the detection of trace amounts of pesticides. These flexible substrates were referred to as Ag NSPs/tape and optimized with an enhancement factor (EF) of ca. 1.7 × 107. A strong resulting signal enhancement could be attributed to an optimal degree of agglomeration and, consequently, the distances among/between spikes. Long spikes on the synthesized core of Ag NSPs tend to be loosely spaced, which are suitable in detecting relatively large molecules that could access the spaces among the spikes where “hot spots” are generally formed. Since one side of the transparent tape is adhesive, the paste-and-peel off method was successful in obtaining phosmet and carbaryl residues from apple peels as reflected in the acquired SERS spectra. In situ trace detection of the pesticides at low concentrations down to 10−7 M could be demonstrated. In situ trace detection of mixed pesticides was possible as the characteristic peaks of both pesticides were observed in equimolar mixtures of the analytes at 10−2 to 10−4 M. This study is, thus, premised upon applying for in situ trace detection on e.g., fruit skin.

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“…The nanoscale optical techniques that have been developed are useful for a variety of applications, including dynamic control of optical tuning in sensing devices. 9 It is anticipated that multifunctional nanoparticles will provide highly intelligent smart sensing and display methods for use in both liquid media and living tissue.…”

Section: Introductionmentioning

confidence: 99%

Magnetically-assembled micro/mesopixels exhibiting light intensity enhancement in the (012) planes of fish guanine crystals

Chikashige

Iwasaka

2017

AIP Advances

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In this study, a new method was investigated to form light-reflecting dots at the micrometer scale using the magnetic orientations of biogenic guanine crystals obtained from fish skin and scales. The crystal platelets, possessing average dimensions of 5 μm×20 μm×100 nm, were dispersed in water and observed during exposure to vertical magnetic fields up to 5 T. The magnetic field direction was parallel to Earth’s gravity, and allowed the narrowest edges of the crystals to be observed at the micrometer scale for the first time. The magnetic orientation process was initiated under conditions where the crystal platelets in water were laid on a glass substrate or where the platelets had random orientations. In the former case, the crystal platelets followed a two-stage magnetic orientation process where, in the first step, the platelet widths were aligned in the magnetic field direction. The second step required rotation of the ∼20-μm-long plates with respect to the Earth’s gravity, where application of a 5 T magnetic field enabled their orientation. Real-time images of the magnetically aligning platelets provided new evidence that the crystal platelets also emitted reflected light from a very narrow window at two crystal planes (i.e., (01¯2¯) and (01¯2)). In the latter case with random platelet orientation, spatially-condensed light-reflecting dots appeared while the guanine crystal platelets were floating and maintaining their orientation. The technique developed for controlling light-reflecting microscale objects in an aqueous medium can be applied to produce a type of microfluidic optical tool.

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Recent progress on colloidal metal nanoparticles as signal enhancers in nanosensing

Cited by 58 publications

References 130 publications

Metal enhanced fluorescence biosensing: from ultra-violet towards second near-infrared window

Metal enhanced fluorescence biosensing: from ultra-violet towards second near-infrared window

Ag Nanostructures with Spikes on Adhesive Tape as a Flexible Sers-Active Substrate for In Situ Trace Detection of Pesticides on Fruit Skin

Magnetically-assembled micro/mesopixels exhibiting light intensity enhancement in the (012) planes of fish guanine crystals

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